The Shamrock (♣) is a symbol of Ireland. It is a three-leafed old white clover. The name shamrock is derived from Irish seamróg, which is the diminutive version of the Irish word for clover (seamair).
It is sometimes of the variety Trifolium repens (white clover, Irish: seamair bhán) but today usually Trifolium dubium (lesser clover, Irish: seamair bhuí). However, other three-leafed plants—such as Medicago lupulina, Trifolium pratense, and Oxilas—are sometimes designated as shamrocks. The shamrock was traditionally used for its medical properties and was a popular motif in Victorian times.
The plant was used by Saint Patrick to illustrate the doctrine of the Trinty.